Thanks a lot. Yours is pretty cool too. However, I agree with other people saying that the element of the bubbles moving might not be the best indicator of frequency of mentions of that word in tweets.
Not sure, how it could be done otherwise, but it needs to be thought a bit more about. Maybe do something more to the bubbles, like coloring and filling them. Maybe even just showing a number inside the bubble if there is room, or when highlighted.
Also, instead of refreshing the page, you could consider something like Socket.io between the web page and your node.js server to update the values. There might be other alternatives to Socket.io, but then you won't have to refresh the entire page.
Thanks for the criticism! This was my first time doing data visualization, so any feedback is really helpful. I'll definitely check out some books by Professor Tufte.
